In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

US grandfather graduates university 50 years after he started studying

Donning a cap and gown and walking out in front of friends and family to graduate is a privilege at any age, but one man has done it at 86.

The US grandfather received a Master of Science degree, 50 years after he started studying for it.

Leo Benatar began the diploma at Georgia Tech in Atlanta in 1954, but left two years later because he had completed all the credits he needed.

The only thing he lacked was a professor to hear his dissertation.

Eight years later, the requirements for obtaining a diploma changed, meaning he didn’t need to do a dissertation and could qualify to graduate.

It then took him close to 50 years to confirm with the university he was eligible.

"When I realised I wanted to graduate and get my degree, I kept talking to the school for months and months, but because there was no electronic record and only a paper trail it was very hard for them to figure out if I had actually qualified or not," he told US TODAY.